Improvement in faraglel ruler



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FREDERICK A.- TRAUT, 0E NEW BRITAIN, CONNECTICUT.

Laim Patent No. 85,708, ma .Imm 5, .1869.

MPROVEIENT IN PARALLEL RULER.

'.lhe chedule referred to inthele Letters Patent: and malng part of the sama.

- Be it known that I, FREDERICK A. TRAUT, of Newv A Britain, county of Hartford, and State of Connecticut,-

have invented certain new and useful Improvements in Parallel Rule; and to enable others skilled in the art to make and use the same, I will proceed to describe itsconstrction and operation, by referring to the drawings, in which the same letters indicate like parts in each of the figures.v

The nature of this invention Will be understood from the specification. and drawings.

.The object desired to be obtained thereby i's to secure perfect nniformity of action and parallelism.

In the accompanying drawings- Figures land 2 are plan views.

Figures 3 and 4, section end'views.

aa are the'two parts of the rule, which move in a line at right angles with each other.

b b are scale-guide bars, one end of which'is secured in the rule a, proper. r

The rule a is provided with mortises to. receive the guide-bars b b.

These bars are provided with collars c c and setscrews d d. The object of these collars and set-screws is to regulate the exact distanceat each end. It may be desirable toexpand one part from the other, or so that the. distance may be xed so as to expand the rules more or less at one end than at the other.

e is an elastic cord, arranged in a groove inthe 'back edge of the rule a' passing through holes formed at each end thereof, and secured in depressions formed in theedge of the rule a.

Now, in using this rule, rst set the collars cby the scale marked on the rods or bars b at the distance it is desirable these rules shall expand at each end; then fix the distance by the 'set-screws d.; then, with one hand irmly upon the rule a, draw a line in the usual way', then expand the rule a'- against thecollars c, and hold it 'rmly to the surface `upon which the lines are being drawn, and the rule a will quickly assume its position close to the rule a'xby the action of the elastic cord e. 'This rule, being-made basil-edged, may be used for pencil or ink-lining by turning it over from one side to the other in the common way.

I believe I have thus shown the nature, construction, and advantage of this invention, so as to enable others skilled to make and use the same therefrom.

What I claim, therefore, and desire to secure by Letters Patent, is-

The elastic cord e, in combination with the guide bars b b, collars c c, and rules a a', constructed and arranged substantially as described. v

FREDERICK A. TRAITE. [1.. s.] n Witnesses:

E. W. BLIss, JEREMY W. BLISS. 

